Clean up network/* packages, revamp online status detection

network/environment/dbus_linux_test.go

@@ -1,8 +1,16 @@
 package environment
 
-import "testing"
+import (
+	"os"
+	"testing"
+)
 
 func TestDbus(t *testing.T) {
+	if _, err := os.Stat("/var/run/dbus/system_bus_socket"); os.IsNotExist(err) {
+		t.Logf("skipping dbus tests, as dbus does not seem to be installed: %s", err)
+		return
+	}
+
 	nameservers, err := getNameserversFromDbus()
 	if err != nil {
 		t.Errorf("getNameserversFromDbus failed: %s", err)